Avaliação do efeito da adição de nanotubos de carbonos e vidro borossilicato na sinterização de carbeto de silício.

Abstract

This work aims to compare two sintering agents applied to silicon carbide, namely borosilicate glass (BS) and borosilicate glass with yttrium oxide (BSY), reinforced with carbon nanotubes. The samples produced were weighed and mixed in a high energy mill, and then sintered in a muffle furnace at 1500°C for 2h. The techniques used to characterize the samples were: Scanning Electron Microscopy (SEM), to analyze the morphology at the end of the process and of the raw material; Energy Dispersive X-ray Spectroscopy (EDS), to verify the chemical elements present; Compressive strength test, to evaluate the mechanical performance of the samples. The samples showed no signs that sintering had occurred, mainly by liquid phase. The glass produced had the chemical composition within the expected range. The mechanical resistance of the samples increased as the additive content increased, when compared to the sample without any sintering agent, composed only of silicon carbide. The sample with the highest mechanical strength, which we consider the best of the samples produced, was the sample with 10% Y2O3, 10% BSY and 0.5% of Carbon Nanotubes, presenting a compressive strength of 59.79kgf and density of 3.026g/cm³.